Device for transferring a portion of weft thread to a weft inserting means

ABSTRACT

A device for transferring a portion of weft thread to a weft thread inserting means in a traveling wave loom, the device having a thread coiling member formed with a slot and along which a portion of the thread is adapted to be displaced, as a coil, with the aid of a pusher means extending through the slot, the weft thread inserting means having two flat, juxtaposed lateral walls with the coil of thread being transferred to the inserting means by pushing the inserting means over the coiling member, transfersely of the longitudinal direction thereof, and then pulling-away the inserting means in the longitudinal direction of the coiling member, over one end thereof.

The present invention relates to a device for transferring a portion of weft thread to a weft thread inserting or picking means, the device comprising a thread coiling or winding member formed with a slot therein and along which the portion of thread is adapted to be displaced, as a coil, with the aid of a pusher means extending through the slot, the inserting means comprising two flat, juxtaposed lateral walls with the coil thus formed. being transferred to the inserting means by pushing the inserting means over the coiling member, transversely of the longitudinal direction thereof, and then pulling away the inserting means in the longitudinal direction of the coiling member, over one end thereof.

In these devices, coils of thread of predeterminedlength are pushed by pusher means from a winding zone to a transfer zone. The pusher means serves not only for displacing the coils of thread but also for accurately determining the number of windings of each coil. When the inserting means isbeing pushed over the coiling member, there are forces which act on the coiling 1 member in the lateral direction, so that it must be sufficiently stable. For this reason, in the hitherto known device, the slot provided for the pusher means has been made only sufficiently long as was necessary for determining the number of winding turns in the coil and for displacing the coils of thread.

In the practical operation of the traveling wave looms in which the above-discussed device is employed, difficulties are sometimes encountered on starting the loom. Furthermore, in some cases the cloth produced is found to be insufficiently faultless. It has been found that these disadvantages may be obviated by means of the present invention. The latter is characterized in that the slot extends as far as the end of the coiling member over which the inserter means is drawn, so that the coiling member has, at this end, two separate elements or parts.

It must be assumed that, due to the resilient inserts provided in the interior of the inserter means, the threads or yarns of the coils of threads are pressed against each other at the location of the slot and,' on pushing away from the coiling member are effected during their movement over the portion extending, in the case of the known device, transversely to the longitudinal direction of the coiling member of the delimiting faces of the slot, impinging against this portion. Under some circumstances, this may give. rise to entangling of yarn windings and to knot-formation. If the loom is out of operation for some time, a sticky deposit may form on the coiling member due to the humid atmosphere and the size dust present in the weaving shed.

Therefore, the risk that faulty operation such as has been described hereinabove may take place is further increased.

In addition to the advantages set forth above, the invention has a further advantage in that the device makes it possible to weave, thinner weft yarns than had heretofore been possible in the art.

The invention will now be discussed in greater detail with reference to a preferred embodiment and to the drawings thereof, in which:

FIG. I is a lateral elevational view of a device according to the invention; and

. 2' FIG. 2 shows a section taken along the line II-Il of FIG. 1;.

In both figures, like elements have been given the same reference numerals.

A coiling member 11 is formed with a slot 12 having 7 an open or free end along which a pusher or slide means 13 may be displaced. The coiling member 11 is of blade-like shape. It has two oblique edges 14 and is inserted at 15 intoa slot formed in a-r'otatably mounted member 16, being secured by means of the screw 17 to the latter. The member 16 is mounted in the rotorl9 by means of the pivot or rotary bearing 18. The said rotor has an eyelet 20 through which extends a weft thread 21. The weft thread 21 travels from a supply bobbin (not shown). On rotation of the rotor 19, the thread 21 iswound onto the coiling member 11, since the latter remains at a standstill during this procedure. It is prevented from rotating with the rotor 19 due to the two pins 23 carried by the holder 22 (see FIGS. 1 and 2).

The holder 22 is operatively connected and carried by a holder rod 25 displaceable in its longitudinal direction against the pressure of a holder rod spring 24. The

' pusher or slide means 13 is adapted to be reciprocated along the rail 26, i.e., perpendicular to the plane of FIG. 2. The rail 26 is, on the other hand, carried by one or two slide means pusher. rods 27 which are displaceable in their longitudinal direction and correspondingly biased (in FIG. 2 towards the left) by one or two slide means pusher rod springs 29.

Weft inserting or picking means or shuttles 30 are, in the feed box 31, pushed in continuous sequence from above downwardly and over the coiling member 11.

Each one thereof has two lateral walls 32 each of which carries an insert 33. The lateral walls 32 are connected along the zone 34; along the remaining portion of their periphery they are free from each other (see FIGS. 1 and 2). i

In operation of the device shown in FIGS. 1 and 2, in combination with a traveling wave loom, due to rotation of the rotor 19 the yarn or thread 2l is continuously wound about the coiling member 11. Thereby, it slides down along the obliqueedges 14 and one winding after the other is deposited in the winding or coiling zone 35. As soon as a coil having a predetermined number of turns has been formed, the pusher or slide means 13 passes through the slot 12 at location 13, At this instant in time, the inserting means 30 has already been pushed over the coiling member 11 and the coil located at the transfer zone 36. During this working phase, the blade-like coiling member 11 is preventedfrom rotating by the inserting means 30. The holder 22 is displaced, due tomovementof the rod 25 against the pressure of spring 24, so that the pins 23 are lifted off from the coiling member 11. Thereupon, the pusher or slide means 13 is displaced from position 13' into the position shown, displacing a thread or yarn coil from zone 35 to zone 36 (see FIG. 1). Simultaneously, with this movement, the inserting means 30 pushed over the coiling member 11, is displaced towards the left, where it enters a shed (not shown).

One of the essential features of the present invention consists in that the slot 12 extends as far as the end of the coiling member 11 over which the inserting means 30 is drawn, away from the coiling member. In this manner, unhindered sliding of the weft thread coils is guaranteed. Thereby, the mutual position of the individual turns or windings between the inserts 33 is in no way varied during the pushing-away from the coiling member, so that renewed withdrawal of the weft thread out of the inserter means 30 during the weaving operation is effected in a neat, clean manner.

In order to obtain maximum stability of theblade-like coiling member, the portion arranged above the slot 12 in FIG. 1, i.e., the portion located on that side from which the inserting means 30 is pushed-over, is designed to be wider than the other portion remote from the side at which the inserter means 30 is pushed-over.

thread on said coiling member-in condition to to be displaced as a coil; pusher means extending through said slot for displacing said coil; inserting means comprising of the inserting means in the longitudinal direction of the coiling member over said open end of the slot; characterized in that the open end of said longitudinal slot is located at that end of the said coiling member over which the inserting means is pulled-away.

2. A device according to claim 1 in which the bladelike position is subdivided'into two separate portions, one portion being wider and located at that side from which the inserter means is pushed over 'the blade-like portion.

3. A device according to claim 1 in which said pusher means operates to transfer the desired number of windings forming said coil during said transfer to said inserting means. 

1. A device on a loom for winding and transferring predetermined portions of coiled weft thread to a weft thread inserting means comprising, a coiling member formed with a blade portion including a longitudinal slot having an open end, a rotor means for coiling said thread on said coiling member in condition to to be displaced as a coil; pusher means extending through said slot for displacing said coil; inserting means comprising two flat juxtaposed lateral walls, said coil adapted to be transferred to said inserting means by pushing the inserting means over said coiling member transversely of the longitudinal direction thereof and by pulling-away of the inserting means in the longitudinal direction of the coiling member over said open end of the slot; characterized in that the open end of said longitudinal slot is located at that end of the said coiling member over which the inserting means is pulled-away.
 2. A device according to claim 1 in which the blade-like position is subdivided into two separate portions, one portion being wider and located at that side from which the inserter means is pushed over the blade-like portion.
 3. A device according to claim 1 in which said pusher means operates to transfer the desired number of windings forming said coil during said transfer to said inserting means. 